{"id":158,"date":"2022-05-14T19:45:37","date_gmt":"2022-05-14T11:45:37","guid":{"rendered":"https:\/\/www.lcettsg.cn\/code\/?p=158"},"modified":"2022-11-13T12:02:52","modified_gmt":"2022-11-13T04:02:52","slug":"%e5%ad%97%e7%ac%a6%e7%bb%9f%e8%ae%a1","status":"publish","type":"post","link":"https:\/\/www.lcettsg.cn\/code\/?p=158","title":{"rendered":"\u5b57\u7b26\u64cd\u4f5c"},"content":{"rendered":"\n<p>History grounds us in our roots. History is an important and interesting field of study, and learning the history of our home country can give us a deeper, more meaningful glimpse into our ancestral pasts, and how we got to where we are today. Many people feel like they need a sense of cultural belonging, which is something that studying your roots and being open-minded to the evolution of your culture can provide.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1040\" height=\"501\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220514194444.png\" alt=\"\" class=\"wp-image-159\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220514194444.png 1040w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220514194444-1000x482.png 1000w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220514194444-500x241.png 500w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220514194444-768x370.png 768w\" sizes=\"(max-width: 1040px) 100vw, 1040px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1334\" height=\"770\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/10\/QQ\u622a\u56fe20221002120209.png\" alt=\"\" class=\"wp-image-1014\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/10\/QQ\u622a\u56fe20221002120209.png 1334w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/10\/QQ\u622a\u56fe20221002120209-1000x577.png 1000w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/10\/QQ\u622a\u56fe20221002120209-500x289.png 500w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/10\/QQ\u622a\u56fe20221002120209-768x443.png 768w\" sizes=\"(max-width: 1334px) 100vw, 1334px\" \/><\/figure>\n\n\n\n<p>trim\uff1a\u53bb\u9664\u5b57\u7b26\u4e32\u7684\u524d\u540e\u7a7a\u683c  ltrim:left  rtrim  right <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1156\" height=\"1138\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521191439.png\" alt=\"\" class=\"wp-image-183\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521191439.png 1156w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521191439-1000x984.png 1000w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521191439-500x492.png 500w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521191439-768x756.png 768w\" sizes=\"(max-width: 1156px) 100vw, 1156px\" \/><\/figure>\n\n\n\n<p>&#8216;abc&#8217;= trim(&#8216; abc &#8216;);<\/p>\n\n\n\n<p>rtrim();<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1156\" height=\"1170\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193624.png\" alt=\"\" class=\"wp-image-186\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193624.png 1156w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193624-988x1000.png 988w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193624-494x500.png 494w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193624-768x777.png 768w\" sizes=\"(max-width: 1156px) 100vw, 1156px\" \/><\/figure>\n\n\n\n<p>trim();<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"765\" height=\"374\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193745.png\" alt=\"\" class=\"wp-image-189\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193745.png 765w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521193745-500x244.png 500w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"971\" height=\"622\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521200134.png\" alt=\"\" class=\"wp-image-191\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521200134.png 971w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521200134-500x320.png 500w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/05\/QQ\u622a\u56fe20220521200134-768x492.png 768w\" sizes=\"(max-width: 971px) 100vw, 971px\" \/><\/figure>\n\n\n\n<p>upper:<\/p>\n\n\n\n<p>lower:<\/p>\n\n\n\n<p>Ucfirst:<\/p>\n\n\n\n<p>\u67e5\u627e\u5b57\u7b26\u4e32\u9996\u6b21\u51fa\u73b0\u4f4d\u7f6e\uff1astrpos string  pos<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1151\" height=\"1240\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/11\/image-82.png\" alt=\"\" class=\"wp-image-1428\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/11\/image-82.png 1151w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/11\/image-82-928x1000.png 928w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/11\/image-82-464x500.png 464w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/11\/image-82-768x827.png 768w\" sizes=\"(max-width: 1151px) 100vw, 1151px\" \/><\/figure>\n\n\n\n<p>\u622a\u53d6\uff1a<\/p>\n\n\n\n<p>\u66ff\u6362<\/p>\n\n\n\n<p>\u5b57\u7b26\u4e32\u8f6c\u6570\u5b57<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"844\" height=\"812\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/06\/image-7.png\" alt=\"\" class=\"wp-image-260\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/06\/image-7.png 844w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/06\/image-7-500x481.png 500w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/06\/image-7-768x739.png 768w\" sizes=\"(max-width: 844px) 100vw, 844px\" \/><\/figure>\n\n\n\n<p>substr<\/p>\n\n\n\n<p>Substr(str,start,len)<\/p>\n\n\n\n<p>\u5468\u56fd\u5e73<\/p>\n\n\n\n<p>\u5982\u679cstart\u5927\u4e8e\u603b\u5b57\u7b26\uff0c\u8fd4\u56de\u7a7a\u3002<\/p>\n\n\n\n<p>\u5982\u679clen\u5927\u4e8e\u4e86\u5269\u4f59\u7684\u5b57\u7b26\u6570\u6216\u5982\u679clen\u4e3a\u7a7a\uff0c\u5c06len\u91cd\u7f6e\u4e3a\uff1a<\/p>\n\n\n\n<p>2\uff0c6<\/p>\n\n\n\n<p>\u5982\u679c\u6211\u60f3\u53d6\u6700\u540e\u4e00\u4e2a\u5b57\uff0c-2,<\/p>\n\n\n\n<p>\u5982\u679c\u4e0d\u5b58\u5728\u53c2\u6570len\uff0c\u90a3\u4e48\u8fd4\u56de\u81eastart\u4f4d\u7f6e\u5f00\u59cb\u81f3\u6700\u540e\u7684\u6240\u6709\u5b57\u7b26\uff0c\u7b49\u540c\u4e8e\u5c06len\u8bbe\u4e3a\u603b\u5b57\u7b26\u6570\u51cf\u53bbstart,\u7136\u540e\u518d\u52a01.<\/p>\n\n\n\n<p>\u5982\u679cstart\u662f\u8d1f\u6570\uff0c\u5c06start\u91cd\u7f6e\u4e3a\u6b63\u6570 &nbsp;str\u7684\u603b\u5b57\u7b26\u6570\u51cf\u53bbstart\u7684\u7edd\u5bf9\u503c\u3002<\/p>\n\n\n\n<p>\u5fc5\u987b\u5bf9start\u53calen\u786e\u5b9a\u597d\u503c\u3002<\/p>\n\n\n\n<p>\u5c06\u7ed3\u679c\u53d8\u91cf\u8bbe\u4e3a\u7a7a\uff0c<\/p>\n\n\n\n<p>\u8bbe\u5faa\u73af\u53d8\u91cfi\u8bbe\u4e3astart<\/p>\n\n\n\n<p>\u5c06\u7ed3\u679c\u8bbe\u4e3a\u8fde\u63a5\u7ed3\u679c\u548cstr\u7684\u7b2ci\u4e2a\u5b57\u7b26<\/p>\n\n\n\n<p>\u5c06i\u589e\u52a01\uff0c\u91cd\u590dlen\u6b21<\/p>\n\n\n\n<p>Substr(\u2018\u5468\u56fd\u5e73\u2019,2,1)<\/p>\n\n\n\n<p>\u4f2a\u4ee3\u7801 &nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1103\" height=\"1338\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220702194233.png\" alt=\"\" class=\"wp-image-505\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220702194233.png 1103w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220702194233-824x1000.png 824w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220702194233-412x500.png 412w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220702194233-768x932.png 768w\" sizes=\"(max-width: 1103px) 100vw, 1103px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1129\" height=\"1227\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193327.png\" alt=\"\" class=\"wp-image-549\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193327.png 1129w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193327-920x1000.png 920w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193327-460x500.png 460w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193327-768x835.png 768w\" sizes=\"(max-width: 1129px) 100vw, 1129px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"736\" height=\"1158\" src=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193402.png\" alt=\"\" class=\"wp-image-551\" srcset=\"https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193402.png 736w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193402-636x1000.png 636w, https:\/\/www.lcettsg.cn\/code\/wp-content\/uploads\/2022\/07\/QQ\u622a\u56fe20220723193402-318x500.png 318w\" sizes=\"(max-width: 736px) 100vw, 736px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>History grounds us in our roots. History is an importan [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-158","post","type-post","status-publish","format-standard","hentry","category-13"],"_links":{"self":[{"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=\/wp\/v2\/posts\/158"}],"collection":[{"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=158"}],"version-history":[{"count":19,"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=\/wp\/v2\/posts\/158\/revisions"}],"predecessor-version":[{"id":1429,"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=\/wp\/v2\/posts\/158\/revisions\/1429"}],"wp:attachment":[{"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=158"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lcettsg.cn\/code\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}